atoll

1. is a type of: coral reef - a reef consisting of coral consolidated into limestone
   specific instances:

   • bikini - an atoll in the Marshall Islands; formerly used by the United States as a site for testing nuclear weapons
   • eniwetok - an atoll in the Marshall Islands; site of an amphibious assault in World War II; later used temporarily by the United States to test atomic bombs
   • kwajalein - an atoll in the western Marshall Islands that was used as a Japanese air and naval base during World War II
   • midway islands - an atoll in the Hawaiian Islands some 1300 miles to the northwest of Honolulu; site of an important United States naval base

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